PHP遍历关联数组的几种方法

在PHP中数组分为两类： 数字索引数组和关联数组。其中数字索引数组和C语言中的数组一样，下标是为0，1，2…而关联数组下标可能是任意类型，与其它语言中的hash，map等结构相似。

下面介绍PHP中遍历关联数组的三种方法：

foreach

<?php
$sports = array(
    'football' => 'good',
    'swimming' => 'very well',
    'running'  => 'not good'
	);
	
foreach ($sports as $key => $value) {
    echo $key.": ".$value."<br />";
}
?>

程序运行结果：

football: good
swimming: very well
running: not good

each

<?php
$sports = array(
    'football' => 'good',
    'swimming' => 'very well',
    'running'  => 'not good'
	);
	
while ($elem = each($sports)) {
    echo $elem['key'].": ".$elem['value']."<br />";
}
?>

程序运行结果：

football: good
swimming: very well
running: not good

list & each

<?php
$sports = array(
    'football' => 'good',
    'swimming' => 'very well',
    'running'  => 'not good'
	);
	
while (list($key, $value) = each($sports)) {
    echo $key.": ".$value."<br />";
}
?>

程序运行结果：

football: good
swimming: very well
running: not good